應用於藍芽與全球衛星定位系統之電抗性負載型雙頻槽孔天線

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姓名

羅中宏(Chung-hung Lo) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

應用於藍芽與全球衛星定位系統之電抗性負載型雙頻槽孔天線
(Design of Dual-Band Slot Antenna Loaded with Reactance for Bluetooth and GPS Applications)

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至系統瀏覽論文 ( 永不開放)

摘要(中)

摘要
本論文提出一個利用電抗性負載元件來減小面積的雙頻槽孔天線，此天線設計應用於全球衛星定位系統(GPS L1 band：1.575 GHz)及藍芽傳輸(Bluetooth 2.4~ 2.484 GHz)的頻段上。
一般傳統常見的開路槽孔天線為四分之一波長共振的模式，其天線共振率是由槽孔的長度來決定。傳統開路槽孔天線是藉由一穿過槽孔的微帶線，以電磁耦合的方式饋入，而天線的特性阻抗可藉由調整槽孔的長度或寬度，亦可透過調整饋入微帶線的相對位置來控制。
本論文首先藉由在傳統單頻開路槽孔天線內部加入一負載電容，進而將原本需要四分之一波長的槽孔長度，有效縮小至八分之一波長以內，並提出在負載電容後端加入電感與基板接地面短路，而藉由調整電感感值，使共振頻率可以做微幅的調整；而天線特性阻抗則可藉由在饋入線末端加入一電感，與基板接地面短路，並藉由調整電感感值來達到良好的阻抗匹配。接下來，本論文提出在負載電容後端再加入一串聯電容，並使其與原本的電流路徑分流，以產生雙頻的電流路徑，達成共用槽孔的雙頻天線設計。
本論文提出的電抗性負載型雙頻槽孔天線，可使用厚度為0.8mm的FR4基板，與市售晶片型被動元件製作。雙頻槽孔天線在低頻量測的共振頻率為1.575 GHz，其頻寬為1.555~1.595 GHz；高頻量測的共振頻率為2.450 GHz，頻寬2.400~2.500 GHz，而天線增益峰值在1.575 GHz為2.52dBi；2.4~2.485 GHz增益峰值在0~0.5 dBi之間。

摘要(英)

Abstract
In the thesis, a design of the dual-band slot antenna loaded with reactance is presented. The proposed antenna is applied for GPS (L1：1.575GHz) and Bluetooth (2.4~2.484GHz) applications.
For a conventional open-end slot antenna, the operation frequency is mainly determined by the slot length, which is generally of a quarter wavelength. An open-end microstrip line is conventionally adopted to feed the antenna through electromagnetic coupling. Impedance matching for this structure can be controlled by the length of open stub, and the feeding position. In order to reduce the length of the slot antenna from a quarter wave-length to one- eighth the effective wavelength, we add a load capacitor inside slot. The inductor connected to the ground behind capacitor can be used to adjust the resonant frequency by using different value. Besides, antenna characteristic impedance is also tunable by using different values of inductor which is added at the end of the feed line connected to the ground plane. For dual-band antenna design, a series capacitor is adopted to branch a new antenna resonant current path. Therefore, the proposed dual-band antenna design is achieved in one slot.
Antenna measurements regarding with the return loss, radiation pattern, and axial ratio are conducted for design validation. It is found that the simulation and measurement are in good agreement.

關鍵字(中)

★ 雙頻天線
★ 電抗性負載
★ 開路槽孔天線
★ 槽孔天線

關鍵字(英)

★ open-end slot antenna
★ antenna loaded with reactance
★ dual band
★ slot antenna

論文目次

摘要.............................................................................................................. i
Abstract ..................................................................................................... ii
致謝........................................................................................................... iii
圖目錄........................................................................................................vi
表目錄..................................................................................................... viii
第一章緒論 ............................................................................................... 1
1.1研究動機.............................................................................................................. 1
1.2文獻回顧.............................................................................................................. 2
1.3論文架構.............................................................................................................. 5
第二章天線原理與參數介紹 ................................................................... 6
2.1天線原理簡介...................................................................................................... 6
2.2天線極化.............................................................................................................. 8
第三章微型化單頻槽孔天線 ................................................................. 11
3.1簡介.................................................................................................................... 11
3.2天線架構與模擬結果........................................................................................ 12
3.3天線參數探討.................................................................................................... 19
3.4天線量測與比較................................................................................................ 22
3.5結論.................................................................................................................... 28
第四章微型化雙頻槽孔天線 ................................................................. 29
4.1簡介.................................................................................................................... 29
4.2天線結構與模擬結果........................................................................................ 30
4.3天線參數探討.................................................................................................... 37
4.4天線量測與比較................................................................................................ 39
4.5結論.................................................................................................................... 45
第五章電抗負載型槽孔天線應用......................................................... 46
5.1手持效應分析.................................................................................................... 46
5.2線性極化GPS天線實測 .................................................................................. 48
5.3天線位置與輻射效率........................................................................................ 49
第六章結論 ............................................................................................. 50
參考資料 .................................................................................................. 53

參考文獻

參考資料
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指導教授

丘增杰(Tsen-chieh Chiu)

審核日期

2012-7-19

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